Abstract
A tensor-charge model is developed for the lattice dynamics of the ternary compounds A2B4C 52 and A1B3C 62 . The long-wavelength phonon frequencies are calculated for ZnGeP2 and AgGaS2 crystals. The tensor-charge parameters are determined by comparing the theoretical and experimental values of the infrared intensities of active frequencies. In the crystal ZnGeP2, the tensor charges of the zinc and phosphorus are found to be close to the isotropic charges of the point-ion model, while the tensor charge of germanium is very different from the point-ion charge. In the AgGaS2 crystal, the tensor charges of all the atoms differ appreciably from the point-ion charges. The results are discussed from the point of view of the chemical bond.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 40–44, September, 1980.
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Vladimirov, V.E., Kopytov, A.V. & Poplavnoi, A.S. Lattice dynamics of ZnGeP2 and AgGaS2 in a tensor-charge model. Soviet Physics Journal 23, 784–788 (1980). https://doi.org/10.1007/BF00892525
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DOI: https://doi.org/10.1007/BF00892525